I discourage using IncludeTagError here, because this way jekyll reports a potential error to be in `@file`, while it is actually in the file where the include tag is present. Just let the usual liquid exceptions pass through without rescueing, they'll be rescued and handled properly in [convertible.rb](https://github.com/mojombo/jekyll/blob/master/lib/jekyll/convertible.rb#L92).